Aquarium species profile

Goldfish

Carassius auratus · East Asia (China)

Minimum tank30 gal (single fish)

Adult size8–12" (fancy 6–8")

Care levelEasy

TemperamentPeaceful

Temperature65–72°F

pH range6.5–7.5

Diet

Omnivore – goldfish pellets, gel food, vegetables, sinking wafers

Compatible tank mates

Other goldfish of similar size and type, Weather Loach

Tank mates to avoid

Tropical fish (temperature mismatch), fin-nipping species, very small fish

Care notes

Cold water species; not compatible with tropical setups. Heavy waste producer needing robust filtration. Can live 15–20+ years. Fancy varieties more delicate.

Check the whole aquarium. Tank size alone does not establish compatibility. Confirm adult size, water overlap, social grouping, territory, diet, and the individual animals before stocking.

Check compatibility in Fishician